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I always use tinned stuff within 2 days of opening and putting in the fridge. I got this idea from the baked beans tin recommendation. I suppose it might be ok for longer but I have normally eaten it by then.

I have kept tuna in a sealed container in the fridge for around 5 days before without a problem. I usually rely on my nose.
The onion may taint the fish though so probably good for 2 days I would guess.

I'd keep tuna a couple of days, don't leave in the tin though, put into a dish and cover. the sniff test is usually the way to tell!

the value cans are usually tuna flakes rather than steak or chunks. I know my mum feeds her cat with them as they're cheaper than cat food, but i am sure they are fine for eating too!

when i was on my own I used to buy the Sainsburys 3 packs of mini tuna tins, then it was just enough for one portion. they used to be 99p, think a little more now, so actually work out quite reasonable (i found i'd end up chucking half the other tins out!)

well to be honest i could probably have eaten the whole tin, as i still feel a bit hungry. with baked beans i usually have the whole tin to myself. thanks for the info about storing in another container ive heard about the problem leaving food in tins.

for tuna on its own in airtight container should be ok for 5 days - but smell it to check.
I find if i mix tuna with mayo (i like to add sweetcorn or onion to the mix) then i find that it smells funny after a couple of days and the mayo separates out after the first day - but thats ok you can alwys stir it in again.

I'm eating my way through a can of Sainsbury's Basics tuna (with Sweetcord and Mayo) and very tasty it is too! It's as good as any other tinned tuna I've bought. It's chunky & steaky and isn't like the flaky & slimey brands you mention. I'm on my third day so I think I'll have what remains with chips tonight - don't throw it away! - it's good enough to eat all day...

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